Quectel Wireless Solutions Company Limited 201404UC15M User Manual
UMTS/HSDPA Module Series
UC15 Mini PCIe Hardware Design
UC15_Mini_PCIe_Hardware_Design Confidential / Released 25 / 40
Figure 10: Long Sync Mode Timing
I2C interface can be used to work with PCM interface for the audio codec design. The following table
shows the pin definition of PCM and I2C interfaces.
Table 10: Pin Definition of PCM and I2C Interface
Module firmware has integrated the configuration on NAU8814 application with I2C interface, and works
in short sync mode by default. You can enable this configuration with command AT+QDAI=2, and
AT+QAUDPATH=2 will configure the audio channel to PCM interface, AT+QAUDPATH=0 configures the
audio channel to analog audio interface. Refer to document [2] for details.
Pin No. Pin Name
I/O
Description
Power Domain
30
I2C_SCL
DO
I2C clock signal
Require external pull-up to 2.6V.
32
I2C_SDA
IO
I2C data signal
Require external pull-up to 2.6V.
45
PCM_CLK
IO
PCM clock signal
2.6V
47
PCM_DOUT
DO
PCM data output
2.6V
49
PCM_DIN
DI
PCM data input
2.6V
51
PCM_SYNC
IO
PCM frame sync signal
2.6V